Refactoring AudioDirectiveHandler to support testing

components/copresence/handlers/directive_handler.h

Index: components/copresence/handlers/directive_handler.h
diff --git a/components/copresence/handlers/directive_handler.h b/components/copresence/handlers/directive_handler.h
index b9b1a88cd0d04645f14bf1fa0a26d552b05ad888..76f74fdbbf4f4f58b1c74924d0ddbac2e351d47e 100644
--- a/components/copresence/handlers/directive_handler.h
+++ b/components/copresence/handlers/directive_handler.h
@@ -10,11 +10,11 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
-#include "components/copresence/handlers/audio/audio_directive_handler.h"
 #include "components/copresence/mediums/audio/audio_manager.h"
 
 namespace copresence {
 
+class AudioDirectiveHandler;
 class Directive;
 
 // The directive handler manages transmit and receive directives